Furnace-casing top.



W. MILLER.

FURNAGE CASING TOP.

APPLICATION FILED MAY 4, 1910.

Patented Feb. 28, 1911. F

pa rs ea T rice.

WILLIAM MILLER, OF NEW YORK, N. Y., ASSIGNOR TO THATCI-IER FURNACE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

FURNACE-CASING TOP.

Specification of Letters Patent.

Patented Feb. 28, 1911.

To all whom it may concern:

Be it known that 1, WILLIAM MILLER, a citizen of the United States, and resident of the boroltigh of Brooklyn, in the county of Kings and city and State of New York, have invented certain new and useful Improvements in Furnace-Casing Tops, of which the following is a specification.

In the ordinary furnace casing for hot-air furnaces used for heating dwellings and the like, the fines which receive the heated air from the furnace and conduct it to the various rooms and fioors to be heated enter the casing near the outer margin thereof. The casing tops as ordinarily constructed are either fiat through the entire area or have a slightly upwardly and inwardly inclined wall through which the fiues extend, said wall extending inwardly from the outer margin of the casing top. In both of these arrangements it is found that some of the fines receive air of a higher temperature than others, owing to the differences in temperature of the various parts of the furnace over which the air travels before it reaches the top of the furnace. This variable heating of he air accounts for the fact that in air heating furnaces for household use some fines seem to draw better than others and deliver air at a higher temperature than other fines. This is manifest from the fact that in the ordinary arrangement of the fiues the air travels straight up the sides of the furnace casing top and direct-1y into the nearest flue. In furnaces with fines arranged as has heretofore been the practice it is practically impossible to have the air in all the fines of a substantially uniform temperature for the reason that the various parts of the furnace over which the air travels are not of the same temperature.

It is the main object of this invention to so construct the furnace casing top that the air will be brought together in an equalizing chamber in order to bring it all to a uniform temperature before it passes to the fiues.

Another object of the invention is to so connect all of the fines to a central equalizing chamber that each flue will take its proper proportion of air after the temperature of the air has been equalized by a comingling of the air in the equalizing chamber.

In the drawings Figure 1 is a vertical sectional view of the casing top and a portion of the furnace casing; and Fig. 2 is a plan view thereof, a portion of the casing being shown in horizontal sectional view.

Referring to the various parts by numerals 1 designates the upper end of the furnace casing, which, of course, may be of any suitable construction. To the upper end of this casing is fitted the casing top 2. This top consists of an annular depending flange 3 adapted to fit the upper end of the casing top; the upwardly and inwardly inclined wall 4 which extends inwardly and upwardly from the upper edge of the flange 3. This upwardly and inwardly inclined defiector wall t may be of any desired length, and to its upper edge is connected the upwardly extending vertical flange 5 which forms the side wall of a dome or co-mingling chamber. This chamber may be of any suitable diameter, and the size thereof will be properly proportioned to the capacity of the furnace and the number of fines to be supplied with air. The upper end of this chamber or dome portion is closed by a top plate 6, said top plate being downwardly and inwardly in clined on its lower surface to a central point 7, said under surface being in the nature of an inverted cone. This plate is shown as being made of sheet metal dished on its upper surface, but, of course, it may be constructed in any suitable manner and of any suitable material.

Entering the dome part or co-mingling chamber through the vertical wall thereof are the fiue connecting pipes 8, said pipes entering said wall preferably near its upper edge in order that there shall be no appreciable space between the upper sides of said flue connections and the under surface of the distributing wall. The object of this arrangement is that there shall be no dead air space in the co-mingling chamber above the fines. It is manifest that as many fiues as may be desired may be connected to the co-mingling chamber, due regard being had, of course, to the air heating capacity of the furnace.

In operation the heated air rises in the casing, strikes the deflector wall 4., and by it is directed into the co-mingling chamber. In this chamber the currents of air of different temperatures are co-mingled and the temperatures thereof equalized. The air then contacts with the distributing surface of the top and is by it directed outwardly into the fines. It is manifest that from this construction each flue will receive its proper proportion of the air in the comingling chamber, and that all of the air delivered to the fines will be of a uniform temperature. The fines are all brought into the -mingling chamber slightly downwardly inclined so that the air will naturally rise slightly in passing out through said fines.

I prefer to arrange the flues equal distances apart around the dome, but, of course this is not at all necessary, and they may be arranged in any convenient position. The height of the wall of the dome part is preferably equal to the diameter of the largest flue leading from the dome. The smaller fines are arranged near the upper edge of the said vertical wall as heretofore described.

I have found in actual practice that air heating furnaces having a casing top of the ordinary construction and operating to supply the flues with air of varying temperatures have been entirely cured of this defect by applying thereto my peculiar form of top, and that after the application of my top to said furnaces the air supplied to the fiues has been of uniform temperature and that r the fiues have each received a un1formI means for securing it to the upper edge of a i furnace casing and provided with an elevated central contracted co-mingling chamber having a vertical side wall and a top downwardly and inwardly inclined on its inner or lower surface to form a distributing wall and a series of flue connections entering said co-mingling chamber through the vertical wall thereof, and an upwardly and inwardly inclined deflector wall extending from the upper edge of the furnace casing to the lower edge of the said co-mingling chamber.

2. A furnace casing top formed with means for securing it to the upper edge of a furnace casing and provided with an elevated central contracted co-mingling chamber having a vertical side wall and a top downwardly and inwardly inclined on its inner or lower surface to form a distributing wall and a series of flue connections entering said co-mingling chamber near the upper edge of the vertical side wall of said chamber close to the outer margin of the said distributing wall, and an upwardly and inwardly inclined deflector wall extending from the upper edge of the furnace casing to the lower edge of the said co-mingling chamber.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses this 28th day of April 1910.

WILLIAM MILLER Vitnesses WVM. It. DAVIS, F. R. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, 1). C. 

